Proportional flow valve

Description

[0001] This patent application claims the benefit of priority of patent CN2020111063442A, filed on October 15, 2020, and entitled “Proportional Flow Valve”, the full content of which is incorporated herein by reference for all purposes. This application constitutes a split application of patent application BR112023006310-8. Technical field

[0002] The invention relates to the technical field of gas flow control and valves, in particular to a proportional flow valve. Fundamentals

[0003] In a proportional flow valve, the output flow value has a linear relationship with the valve core opening, and the valve core opening has a linear relationship with the input electrical signal through the intermediate conversion mechanism, thus determining the linear relationship between the output flow value and the input signal.

[0004] Typically, regular solenoid valves adopt the structure of an electromagnetic coil and a linear spring, which is generally used as an on-off valve, i.e., the electromagnetic coil overcomes the spring force to open the valve core after being energized. The electromagnetic force generated by the electromagnetic coil has an exponential relationship with the air space, while the linear spring has a linear relationship with the amount of compression or extension; in the case of the same displacement, Petition 870260066620, dated 06 / 07 / 2026, page 9 / 102 2 / 27 The aggregate value of the electromagnetic force is greater than that of the linear spring; therefore, the valve core opening can be opened directly to the maximum. However, it is difficult to meet the requirement that the proportional flow valve be stable in a given position during valve gate opening; therefore, the linear relationship between the output flow value and the input signal cannot be achieved, and proportional flow adjustment cannot be performed.

[0005] Patent EP3263962 A1 proposes a valve for liquid and gaseous media, comprising a valve body with a valve chamber. It may be in fluid communication with at least one inlet and at least one outlet. The valve has a pre-compression element that applies a pre-compression force to push the valve into its operating position. The valve has a controller that operates together with it, allowing the controller to move the valve.

[0006] Patent DE10200915 A1 provides an electromagnetic valve for the vehicle brake system. The aim is to improve the design and structure of the pressure-balanced solenoid valve as a two-stage valve, which requires a complex structure. The electromagnetic valve is hydraulically pressure-balanced by means of a pressure balancing channel that passes through the valve closing element and the valve stem in the direction of the valve stem axis and extends into the magnetic implant space. The armature space is connected only to the main brake cylinder connection through the pressure balancing channel in the closed base position of the valve closing element.

[0007] In some working conditions, such as the transfer fan, the Venturi nozzle is generally used to introduce air after the proportional valve, but the gas passing through the proportional valve would generate a large backpressure when passing through the Venturi nozzle, which leads the proportional valve to not function normally under the high backpressure working condition and therefore unable to perform the proportional flow adjustment. Petition 870260066620, dated 06 / 07 / 2026, page 10 / 102 3 / 27

[0008] Until now, there is no suitable proportional flow valve on the market that can solve the above problems. Therefore, it is necessary to design a new proportional flow valve that can not only resolve the influence of high back pressure, but also work stably. Technical solutions

[0009] The main objective of this invention is to provide a proportional flow valve that aims to resolve the influence of high back pressure and allow the proportional flow valve to operate stably.

[0010] In order to achieve the above objective, the proportional flow valve provided by the present invention includes: a valve housing assembly, formed with a mounting cavity with an opening at the lower end, an air inlet bank is formed at one opening end of the mounting cavity and located in the middle part of the mounting cavity, and an air inlet passage extending upwards and downwards is formed in the air inlet bank; an electromagnet assembly, arranged at one upper end of the mounting cavity and used to provide upward magnetic attraction; A valve core assembly, arranged in the mounting cavity and located in the middle part of the mounting cavity, an annular mounting cavity is formed between the valve core assembly and a surface of the inner wall of the mounting cavity; driven by magnetic attraction, the valve core assembly has an upward stroke; an air guide passage is formed in the valve core assembly, an air guide passage inlet is formed at a lower end of the valve core assembly and is connected to the air inlet passage, and an outlet is formed at the lateral end of the valve core assembly; a sealing ring structure, including a sealed sealing ring in Petition 870260066620, dated 06 / 07 / 2026, page 11 / 102 4 / 27 annular mounting cavity, an inner ring of the sealing ring is wrapped around the valve core assembly and an outer ring of the sealing ring is fixedly installed in the mounting cavity, so as to separate the annular mounting cavity into a closed upper annular mounting cavity and a closed lower annular mounting cavity, and the upper annular mounting cavity is connected to the air guide passage outlet; a preload force structure, disposed between the valve core assembly and an inner wall of the mounting cavity, and used to provide downward preload force to the valve core assembly; and an air outlet space communicating with the lower annular mounting cavity may be formed, in use, between the lower end of the valve core assembly and an upper end of the air inlet bank; The electromagnet assembly includes a coil that extends upwards and downwards and is fixedly installed in the mounting cavity and a static device fixedly installed in an internal hole of the coil; when the coil is electrified, the static device forms the magnetic attraction; the valve core assembly includes a moving device and a central device; the moving device is inserted between the static device and the valve core; an upper end of the moving device is spaced from a lower end of the static device, so as to form an electromagnetic air gap; a lower end of the moving armature is connected to an upper end of the valve core, and the air outlet space is formed between a lower face of the valve core and an upper face of the air inlet bank; The valve body assembly includes: an enclosure, one lower face of the enclosure is penetrated with a mounting hole extending upwards and downwards, and the coil is mounted in the mounting hole; Petition 870260066620, dated 06 / 07 / 2026, page 12 / 102 5 / 27 a second annular support bank, installed at the lower end of the housing, and an internal hole of the second annular support bank is communicated with the mounting hole to jointly form the mounting cavity; a valve body, installed in the inner orifice of the second annular support bank and located above the air inlet bank; and the valve body and the air inlet bank are arranged integrally; or the lower face of the valve core is provided with a connection orifice; One lower face of the movable armor is provided with a third mounting hole extending upwards and downwards; The valve core assembly also includes a connecting column; the upper end of the connecting column is installed in the third mounting hole, the lower end of the connecting column is inserted into the connecting hole, and the air guide passage is formed in the connecting column.

[0011] In one embodiment, the preload force structure includes an annular elastic sheet, an inner end of the annular elastic sheet is fixed to the valve core assembly and an outer end is fixed to the inner wall of the mounting cavity; an annular surface of the annular elastic sheet is provided with a hollow pattern combination, the hollow pattern combination is a central symmetrical structure and includes a plurality of hollow pattern units and the number of hollow pattern units is an integer multiple of the natural number 2 or more.

[0012] In one embodiment, a first air guide passage segment is installed on the face of the lower end of the valve core and the face of the lower end of the movable armature is provided with a first mounting hole extending upwards and downwards; a side wall surface of the first mounting hole is provided with a second air guide passage segment, the upper end of the valve core is installed in the first mounting hole and the first air guide passage segment is connected to the second air guide passage segment. Petition 870260066620, dated 06 / 07 / 2026, p. 13 / 102 6 / 27 air to jointly form the air guide passage; and / or the movable armature is positioned at a lower end of the inner bore of the coil and a non-metallic magnetic separator is arranged between the upper end of the movable armature and the lower end of the static armature; and / or the movable armature is at least partially positioned in the coil and has a mounting segment positioned in the coil; The proportional flow valve further includes a first magnetic shielding sleeve that extends upwards and downwards, and the first magnetic shielding sleeve is disposed between the coil and the moving armature and covers at least partially the mounting segment.

[0013] In one embodiment, an upper end of the first magnetic shielding sleeve is positioned in the inner hole of the coil and a lower end of the first magnetic shielding sleeve projects from a lower end of the coil; The lower end of the static armor and the upper end of the movable armor are both installed in the first magnetic shielding sleeve, and the side wall of the static armor is in sealing contact with an inner wall of the first magnetic shielding sleeve.

[0014] In one embodiment, the air guide passage is formed in the valve core and in the moving armature; An air gap is formed between a side wall of the movable armature and an outer side wall of the first magnetic shielding sleeve, and the air gap communicates with the electromagnet's air gap, the air guide passage outlet, and the upper annular mounting cavity.

[0015] In one embodiment, the mounting cavity is arranged in steps to form a first annular step surface oriented downwards; The proportional flow valve also includes a first annular support bank located below the surface of the first annular step and the outer ring of the first. Petition 870260066620, dated 06 / 07 / 2026, page 14 / 102 7 / 27 annular support bank is in sealing contact with an inner side wall of the mounting cavity, the inner ring of the first annular support bank is lined in the valve core assembly and a first annular mounting space is formed between a face of the upper end of the first annular support bank and the surface of the first annular step and the sealing ring is fastened in the annular space.

[0016] In one embodiment, an inner orifice of the first annular support bank is set as a conical orifice, wherein the diameter of an upper end of the conical orifice is smaller than the diameter of a lower end of the conical orifice; The lower end of the valve core assembly extends from a lower end of the conical orifice and movably abuts against the face of the upper end of the air inlet bank, and the lower end of the valve core assembly is arranged in steps to form a second annular step surface arranged upwards; The preload force structure includes an annular elastic sheet, an inner ring of the annular elastic sheet rests against the surface of the second annular step, and an outer ring of the annular elastic sheet is fixed to a face of the lower end of the first annular support bench, and the surface of the second annular step is located above the face of the lower end of the first annular support bench.

[0017] In one embodiment, a side wall of the upper end of the valve body is threaded into an inner wall of the inner bore of the second annular support bank; and / or the second annular support bank includes a support bank cylinder and a second magnetic shield sleeve extending upward from a face of the upper end of the support bank cylinder, the face of the upper end of the support bank cylinder is in sealing contact with the face of the lower end of the housing, an upper end of the second magnetic shield sleeve extends into the inner bore of the coil, the lower end of the Petition 870260066620, dated 06 / 07 / 2026, page 15 / 102 8 / 27 The static armature and the upper end of the movable armature are both installed in the second magnetic shielding sleeve, and the side wall of the static armature is in sealing contact with an inner wall of the second magnetic shielding sleeve; and / or a face of the upper end of the valve body is penetrated with a second mounting hole, and the second mounting hole is arranged in steps to form an upward-disposed contact step surface, and the proportional flow valve further includes a first fastening assembly, the first fastening assembly is arranged annularly and located on the contact step surface; an outer ring of the first fastening assembly is in sealing contact with an inner wall surface of the second mounting hole; a first annular fastening space is formed in the first fastening assembly;The inner ring of the sealing ring is hermetically sealed within the valve core assembly, and the outer ring of the sealing ring is secured in the first annular mounting space.

[0018] In one embodiment, the proportional flow valve further includes a transition block, the transition block is positioned in the mounting hole and below the coil, and the transition block is hermetically enclosed in a lower end of the second magnetic shielding sleeve, a side wall of the transition block is in sealing contact with a side wall of the mounting hole and a face of the lower end of the transition block is mounted on the face of the upper end of the support bank cylinder;and / or an inner bore of the support bank cylinder is fitted as a conical bore, wherein the diameter of an upper end of the conical bore is smaller than the diameter of a lower end of the conical bore, and the lower end of the valve core assembly is arranged in steps to form an upward-facing annular third-step surface, and the preload force structure includes an annular elastic sheet, the inner ring of the annular elastic sheet abuts the surface of; Petition 870260066620, dated 06 / 07 / 2026, page 16 / 102 9 / 27 third annular step and the outer ring of the annular elastic leaf is fixed to the face of the upper end of the valve body.

[0019] In one embodiment, the connecting column is arranged in steps to form a fourth-step surface facing upwards and a second annular mounting space is formed between the fourth-step surface and the face of the lower end of the movable reinforcement; The mounting cavity is formed with the surface of the fifth step facing downwards, and the surface of the fifth step is located below the surface of the fourth step; The preload force structure includes an annular elastic sheet; the inner ring of the annular elastic sheet is fixed in the second annular mounting space, and the outer ring of the annular elastic sheet rests against the surface of the fifth step.

[0020] In one embodiment, the connecting column is also formed with a sixth-step surface arranged downwards and a third annular mounting space is formed between the sixth-step surface and a face of the upper end of the valve core; The mounting cavity is formed with a seventh annular step surface arranged downwards, and the seventh annular step surface is provided with a second fastening assembly. The second fastening assembly is arranged annularly, with an outer ring of the second fastening assembly in sealing contact with the inner wall surface of the mounting cavity, and a fourth annular fastening space is formed in the second fastening assembly. The inner ring of the sealing ring is fixed in the third annular mounting space and the outer ring of the sealing ring is fixed in the fourth annular mounting space.

[0021] According to the technical solution provided by the invention, the air inlet passage is connected to the air guide passage, therefore, the gas in the air inlet of the air inlet passage is introduced into the upper annular mounting cavity. Petition 870260066620, dated 06 / 07 / 2026, page 17 / 102 10 / 27 closed, the sealing ring generates a downward pressure on the valve core assembly. And the preload force structure provides a downward preload force on the valve core assembly, when the proportional solenoid valve is not operating, the pressure and preload force form a resulting downward force, so that the lower end of the valve core assembly is in sealing contact with the upper end of the air inlet bank to prevent air leakage from the proportional solenoid valve; when the proportional solenoid valve operates, the valve core assembly is subjected to an upward electromagnetic force provided by the electromagnet assembly, and the air pressure from the air inlet provides an upward thrust force to the valve core assembly;When there is no back pressure in the air outlet space, the four forces—pressure force, preload force, electromagnetic force, and thrust force—are balanced, so the valve core assembly can be stabilized in the working position. When there is back pressure in the air outlet space, the back pressure provides an upward back pressure to the valve core. In this case, the five forces—pressure force, preload force, electromagnetic force, thrust force, and back pressure—are balanced, so the valve core can still be stable in the working position. Therefore, the proportional valve can work stably under different working conditions, the impact of high back pressure on the proportional flow valve is eliminated, and the effect is good. Brief description of the figures

[0022] In order to illustrate the technical solutions in the embodiments of the present invention or in the prior art more clearly, the drawings in the description of the embodiments of the present invention will be briefly introduced below. It is obvious that the drawings in the following description show only some embodiments of the present invention. One skilled in the art can obtain other drawings according to the structures shown in these drawings without any creative effort. Petition 870260066620, dated 06 / 07 / 2026, p. 18 / 102 11 / 27

[0023] Fig. 1 is a schematic structural diagram of a first embodiment of a proportional flow valve according to the present invention.

[0024] Fig. 2 is a schematic structural diagram of a second embodiment of a proportional flow valve according to the present invention.

[0025] Fig. 3 is a schematic structural diagram of a third embodiment of a proportional flow valve according to the present invention.

[0026] Fig. 4 is a structural diagram of an embodiment of the annular elastic sheet shown in Fig. 1.

[0027] Fig. 5 is a structural diagram of another embodiment of the annular elastic sheet shown in Fig. 1.

[0028] Fig. 6 is a curve diagram showing the relationship between the electromagnetic force and the air gap of the electromagnet of the proportional flow valve according to the present invention.

[0029] Fig. 7 is a curve diagram showing the relationship between the preload force and the valve core opening of the proportional flow valve according to the present invention.

[0030] Fig. 8 is a curve diagram showing the relationship between each force and the valve core displacement of the proportional flow valve according to the present invention.

[0031] The reference marks in the drawings are as follows: Reference Signal Characteristic Reference Signal Characteristic 100 Proportional flow valve 351 Fourth step surface 1 Valve housing assembly 352 Sixth step surface Petition 870260066620, dated 06 / 07 / 2026, p. 19 / 102 12 / 27 11 First annular step surface 41 Sealing ring 12 Housing 51 Annular elastic plate 13 Second annular support bank 6 Air opening 131 Support bank cylinder 61 Air inlet passage 132 Second magnetic shielding sleeve 62 Air outlet passage 14 Valve body 7 Non-metallic magnetic separator 141 Pillar step surface 8 First magnetic shielding sleeve 15 Fifth step surface 9 First annular support bank 16 Seventh annular step surface 10 First fixing assembly 2 Electromagnet assembly 101 Transition block 21 Coil 102 Second fixing assembly 22 Static armature a Annular mounting cavity 31 Moving armature a1 Upper annular mounting cavity 311 First mounting hole a2 Lower annular mounting cavity 32 Valve b Air guide passage 33 Surface of the second b1 First segment of Petition 870260066620, dated 06 / 07 / 2026, page 20 / 102 13 / 27 annular step air guide passage 34 Surface of the third annular step b2 Second segment of the air guide passage 35 Connection column Table 1

[0032] The characteristics, functions, objects and advantages of the present invention will be further illustrated with reference to the drawings and embodiments. Detailed description of the embodiments of the invention.

[0033] Hereafter, the technical solutions in the embodiments of the invention will be clearly and completely described with reference to the drawings. It is evident that the embodiments described are some, but not all, of the embodiments of the present invention. All other embodiments obtained by one skilled in the art without any creative effort based on the embodiments in the present invention shall fall within the scope of the present invention.

[0034] It should be noted that the directional indications (such as up, down, left, right, forward, backward, etc.) in the embodiments of this invention are used only to illustrate the relative position relationship between the components and their movement at a certain point of view (as shown in the drawings), and if the point of view changes, the directional indications would also change accordingly.

[0035] Furthermore, terms such as first and second in the embodiments of this invention are used for descriptive purposes only and cannot be considered as indicating or implying their relative priorities or implicitly indicating the number of technical features indicated. Therefore, the features defined as first and second may explicitly or implicitly include at least one of the indicated features. In addition, the meaning of and / or in the description includes three alternative solutions. For example, A and / or B includes Solution A, Solution B, or Solution A and Solution B. Furthermore, the technical solutions of each embodiment may Petition 870260066620, dated 06 / 07 / 2026, page 21 / 102 14 / 27 can be combined with each other, on the premise that they can be achieved by those skilled in the art. When the combination of technical solutions is contradictory or impossible, it should be considered that this combination of technical solutions does not exist and does not fall within the scope of protection of the present invention.

[0036] In a proportional flow valve, the output flow value has a linear relationship with the valve core opening, and the valve core opening has a linear relationship with the input electrical signal through the intermediate conversion mechanism, thus determining the linear relationship between the output flow value and the input signal.

[0037] Typically, regular solenoid valves adopt the structure of an electromagnetic coil and a linear spring, which is generally used as an on-off valve, i.e., the electromagnetic coil overcomes the spring force to open the valve core after being energized.The electromagnetic force generated by the electromagnetic coil has an exponential relationship with the air space, while the linear spring has a linear relationship with the amount of compression or extension; in the case of the same displacement, the aggregate value of the electromagnetic force is greater than that of the linear spring, therefore the valve core opening can be opened directly to the maximum. However, it is difficult to meet the requirement that the proportional flow valve be stable in a given position during the opening of the valve port, therefore the linear relationship between the output flow value and the input signal cannot be achieved and proportional flow adjustment cannot be performed.

[0038] In some working conditions, such as the transfer fan, the Venturi nozzle is generally used to introduce air after the proportional valve, but the gas passing through the proportional valve would generate a large backpressure when passing through the Venturi nozzle, which leads to the proportional valve not functioning normally under the high backpressure working condition and therefore unable to perform proportional flow adjustment.

[0039] So far, there is no suitable proportional flow valve on the market that can Petition 870260066620, dated 06 / 07 / 2026, page 22 / 102 15 / 27 solve the above problems. Therefore, it is necessary to design a new proportional flow valve that can not only resolve the influence of high backpressure, but also work stably.

[0040] The invention provides a proportional flow valve, wherein Figs. 1 to 5 are schematic structural diagrams of the proportional flow valve of the embodiments according to the invention.

[0041] Referring to Figs. 1 to 3, the proportional flow valve 100 includes a valve housing assembly 1, an electromagnet assembly 2, a valve core assembly, a sealing ring structure 41, and a preload force structure. The valve housing assembly 1 is formed with a mounting cavity with an opening at the lower end; an air inlet bank 6 is formed at one end of the mounting cavity opening and located in the central part of the mounting cavity, and an air inlet passage 61 extending upwards and downwards is formed in the air inlet bank 6; the electromagnet assembly 2 is arranged at an upper end of the mounting cavity and used to provide upward magnetic attraction; the valve core assembly is arranged in the mounting cavity and located in the central part of the mounting cavity;An annular mounting cavity a is formed between the valve core assembly and a surface of the inner wall of the mounting cavity; driven by magnetic attraction, the valve core assembly has an upward stroke; an air guide passage b is formed in the valve core assembly, an inlet of the air guide passage b is formed at a lower end of the valve core assembly and is connected to the air inlet passage 61, and an outlet is formed at the lateral end of the valve core assembly; the sealing ring structure includes a sealing ring 41 sealed in the annular mounting cavity a, an inner ring of the sealing ring 41 is wrapped around the valve core assembly and an outer ring of the sealing ring 41 is fixedly installed in the mounting cavity, de; Petition 870260066620, dated 06 / 07 / 2026, page 23 / 102 16 / 27 mode to separate the annular mounting cavity into a closed upper annular mounting cavity a1 and a closed lower annular mounting cavity a2, and the upper annular mounting cavity a1 is communicated with the air guide passage outlet b; the preload force structure is arranged between the valve core assembly and an inner wall of the mounting cavity and used to provide downward preload force to the valve core assembly; and an air outlet space communicating with the lower annular mounting cavity a2 can be formed between the lower end of the valve core assembly and an upper end of the air inlet bank 6.

[0042] According to the technical solution provided by the invention, the air inlet passage 61 is connected to the air guide passage b, therefore, the gas in the air inlet of the air inlet passage 61 is introduced into the closed upper annular mounting cavity 41, the sealing ring 41 generates a downward pressure in the valve core assembly. And the preload force structure provides a downward preload force in the valve core assembly, when the proportional solenoid valve does not operate, the pressure and preload force form a resulting downward force, so that the lower end of the valve core assembly is in sealing contact with the upper end of the air inlet bank 6 to prevent air leakage from the proportional solenoid valve;When the proportional solenoid valve operates, the valve core assembly is subjected to an upward electromagnetic force provided by the electromagnet assembly 2, and the air pressure from the air inlet provides an upward thrust force to the valve core assembly; when there is no back pressure in the air outlet space, the four forces, pressure force, preload force, electromagnetic force and thrust force, are balanced with each other, so that the valve core assembly can be stabilized in the working position; when there is back pressure in the air outlet space, the back pressure provides an upward back pressure to the valve core, in this case, the five forces, force; Petition 870260066620, dated 06 / 07 / 2026, page 24 / 102 17 / 27 pressure, preload force, electromagnetic force, thrust force and backpressure are balanced, so the valve core can still be stable in the working position, therefore, the proportional valve can work stably under different working conditions, the impact of high backpressure on the proportional flow valve 100 is eliminated and the effect is good.

[0043] It should be noted that the air inlet bank 6 is provided with an air outlet passage 62 extending upwards and downwards, when the valve core assembly moves upwards, the lower end of the valve core assembly and the upper end of the air inlet bank 6 form the air outlet space, which communicates with the air inlet passage 61 and the air outlet passage 62 to achieve air outlet.

[0044] In order to enable the preload force structure to provide preload force to the valve core assembly and achieve proportional flow control, the electromagnetic force curve is determined according to the ratio of air outlet gap opening and the rate of change of current. The electromagnetic force curve is non-linear, therefore it is necessary to combine the law of variation of the preload force curve with the electromagnetic force curve to obtain an approximate linear relationship. Therefore, referring to Figs. 5 and 6, the preload force structure includes an annular elastic sheet 51, the inner end of the annular elastic sheet 51 is fixed to the valve core assembly and the outer end is fixed to the inner wall of the mounting cavity, so that the annular elastic sheet 51 would be prone to deformation, thus facilitating the provision of preload force to the valve core assembly.The annular surface of the annular elastic sheet 51 is provided with a hollow pattern combination; the hollow pattern combination is a central symmetrical structure and includes a plurality of hollow pattern units; the number of hollow pattern combinations is an integer multiple of a natural number of 2 or more, so that the preload force structure can provide preload force for the... Petition 870260066620, dated 06 / 07 / 2026, page 25 / 102 The 18 / 27 valve core assembly and the relationship curve between preload force and displacement are consistent with the electromagnetic force curve, thus facilitating proportional flow control.

[0045] The electromagnet assembly 2 includes a coil 21 that extends upwards and downwards and is fixedly installed in the mounting cavity and a static armature 22 fixedly installed in an internal hole of the coil 21; when the coil 21 is electrified, the static armature 22 forms the magnetic attraction; the valve core assembly includes a movable armature 31 and a valve core 32; the movable armature 31 is pressed between the static armature 22 and the valve core 33, an upper end of the movable armature 31 is spaced from a lower end of the static armature 22, so as to form an electromagnet air gap c; a lower end of the movable armature 31 is connected to an upper end of the valve core 32 and the air outlet gap is formed between a face of the lower end of the valve core 32 and an upper face of the air inlet 6.Thus, since the lower end of the moving armature 31 is connected to the upper end of the valve core 32, the motion states of the moving armature 31 and the valve core 32 are consistent; when the coil 21 is energized, the static armature 22 forms a magnetic attraction, changing the size of the air space of the electromagnet c, the magnetic attraction is altered and the amount of change of the air space of the electromagnet c is also the moving distance of the valve core 32 and the magnetic attraction attracts the moving armature 31 to move upwards, thus driving the valve core 32 to move upwards, so that the air outlet space is formed between the face of the lower end of the valve core 32 and the face of the upper end of the air inlet bank 6; therefore, the gas entering the air in passage 61 can be discharged through the air outlet space.

[0046] Specifically, the air guide passage b is formed in the valve core 32 and the moving armature 31, so that the structure is simple and easy to manufacture. Petition 870260066620, dated 06 / 07 / 2026, p. 26 / 102 19 / 27

[0047] In one embodiment, a first air guide passage segment is installed on the face of the lower end of the valve core 32 and the face of the lower end of the movable armature 31 is provided with a first mounting hole 311 extending upwards and downwards; a side wall surface of the first mounting hole 311 is provided with a second air guide passage segment b2, the upper end of the valve core 32 is installed in the first mounting hole 311 and the first air guide passage segment b1 is communicated with the second air guide passage segment b2 to jointly form the air guide passage b. With this arrangement, outside air enters the first air guide passage segment b1 and the second air guide passage segment b2 of the air inlet passage 61 in turn, and finally converges in the closed upper annular mounting cavity a1.And the converging gas causes the sealing ring 41 to generate a downward pressure in the valve core 32, so that the lower end of the valve core 32 is in sealing contact with the upper end of the air inlet bank 6 and the proportional flow valve 100 is prevented from leaking.

[0048] It should be noted that the air guide passage b is formed in the core of the valve 32, so the structure is simple and easy to manufacture.

[0049] With reference to Fig. 3, the movable armature 31 is positioned at a lower end of the inner hole of the coil 21 and a non-metallic magnetic separator 7 is arranged between the upper end of the movable armature 31 and the lower end of the static armature 22. This arrangement plays a damping role and prevents the movable armature 31 from colliding with the static armature 22 and being damaged under the action of the electromagnetic force.

[0050] With reference to figs. 1 and 2, the movable armature 31 is at least partially positioned on the coil 21 and has a mounting segment positioned on the coil 21; the proportional flow valve 100 further includes a first magnetic shielding sleeve 8 that extends upwards and downwards, and the first sleeve of Petition 870260066620, dated 06 / 07 / 2026, page 27 / 102 20 / 27 magnetic shielding 8 is disposed between coil 21 and moving armature 31 and covers at least partially the mounting segment. In this way, the first magnetic shielding sleeve 8 covers the mounting segment, so as to prevent the moving armature 31 from generating electromagnetic force after coil 21 is electrified, thus avoiding affecting the sensitivity of the moving armature 31 under the electromagnetic force of the static armature 22.

[0051] It should be noted that there are many types of materials that can be used to achieve the magnetic insulation effect, such as silicon steel, stainless steel, and copper.

[0052] In the present invention, the first magnetic shielding sleeve 8 is made of copper.

[0053] In one embodiment, an upper end of the first magnetic shielding sleeve 8 is positioned in the inner hole of the coil 21 and a lower end of the first magnetic shielding sleeve 8 projects from a lower end of the coil 21; The lower end of the static armature 22 and the upper end of the movable armature 31 are both installed in the first magnetic shielding sleeve 8, and the side wall of the static armature 22 is in sealing contact with an inner wall of the first magnetic shielding sleeve 8. This arrangement prevents the static armature 22 and the first magnetic shielding sleeve 8 from leaking air, thus avoiding affecting the air tightness of the proportional flow valve 100.

[0054] Referring to Figs. 1 and 2, the air guide passage b is formed in the valve core 32 and the movable armature 31; an air space is formed between a side wall of the movable armature 31 and an outer side wall of the first magnetic protective sleeve 8, and since the air space communicates with the air space of the electromagnet c, the outlet of the air guide passage be is the upper annular mounting cavity a1, the external air can be converged in the closed upper annular mounting cavity a1 after passing through the air space of the electromagnet c, the air guide passage be is the air space of the air inlet passage 61. The converging gas causes the ring Petition 870260066620, dated 06 / 07 / 2026, p. 28 / 102 21 / 27 seal 41 generates a downward pressure in the valve core 32, so that the lower end of the valve core 32 is in sealing contact with the upper end of the air inlet bank 6 and the proportional flow valve 100 is prevented from leaking.

[0055] With reference to Fig. 1, the mounting cavity is arranged in steps to form a first annular step surface 11 oriented downwards; the proportional flow valve 100 further includes a first annular support bank 9 located below the surface of the first annular step 11 and the outer ring of the first annular support bank 9 is in sealing contact with an inner side wall of the mounting cavity, the inner ring of the first annular support bank 9 is wrapped around the valve core assembly and a first annular mounting space is formed between a face of the upper end of the first annular support bank 9 and the surface of the first annular step 11, and the sealing ring 41 is fastened in the annular space. With this arrangement, the installation of the sealing ring 41 is carried out.

[0056] In one embodiment, an inner orifice of the first annular support bank 9 is fitted as a conical orifice, wherein the diameter of an upper end of the conical orifice is smaller than the diameter of a lower end of the conical orifice; the lower end of the valve core assembly extends from a lower end of the conical orifice and movably abuts against the face of the upper end of the air inlet bank 6 and the lower end of the valve core assembly is arranged in steps to form a second annular step surface 33 arranged upwards;The preload force structure includes an annular elastic sheet 51, an inner ring of the annular elastic sheet 51 rests against the surface of the second annular step 33 and an outer ring of the annular elastic sheet 51 is fixed to a face of the lower end of the first annular support bench 9 and since the surface of the second annular step 33 is located above the face of the lower end of the first annular support bench 9, the annular elastic sheet 51 generates a force; Petition 870260066620, dated 06 / 07 / 2026, page 29 / 102 22 / 27 downward preload in the valve core assembly, which has a good effect. And the tapered orifice, in which the diameter of an upper end of the tapered orifice is smaller than the diameter of a lower end of the tapered orifice, thus providing a space for activity for the annular elastic sheet 51.

[0057] With reference to Fig. 2, the valve housing assembly 1 includes a housing 12, a second annular support bank 13 and a valve body 14. One face of the lower end of the housing 12 is penetrated with a mounting hole extending upwards and downwards and the coil 21 is mounted in the mounting hole; the second annular support bank is installed at the lower end of the housing 12 and an inner hole of the second annular support bank 13 is communicated with the mounting hole to jointly form the mounting cavity; the valve body is installed in the inner hole of the second annular support bank 13 and located above the air inlet bank 6; the valve body 14 and the air inlet bank 6 are arranged integrally so as to facilitate precise machining.

[0058] Specifically, a side wall of the upper end of the valve body 14 is threaded into an inner wall of the inner orifice of the second annular support bank 13. With this arrangement, the valve body 14 and the second annular support bank 13 are hermetically connected, and disassembly and assembly are convenient.

[0059] With reference to Fig. 2, the second annular support bank 13 includes a support bank cylinder 131 and a second magnetic shielding sleeve 132 extending upwards from a face of the upper end of the support bank cylinder 131, the face of the upper end of the support bank cylinder 131 is in sealing contact with the face of the lower end of the housing 12, an upper end of the second magnetic shielding sleeve 132 extends into the inner bore of the coil 21, the lower end of the static armature 22 and the upper end of the moving armature 31 are both installed in the second sleeve Petition 870260066620, dated 06 / 07 / 2026, page 30 / 102 23 / 27 of magnetic shielding 132 and the side wall of the static armature 22 is in sealing contact with an inner wall of the second magnetic shielding sleeve 132. In this way, the upper end of the moving armature 31 is covered by the second magnetic shielding sleeve 132, so as to prevent the moving armature 31 from generating electromagnetic force after the coil 21 is energized, thus avoiding affecting the sensitivity of the moving armature 31 under the electromagnetic force of the static armature 22.

[0060] In order to install the sealing ring 41, referring to Fig. 2, a face of the upper end of the valve body 14 is penetrated with a second mounting hole and the second mounting hole is arranged in steps to form a contact step surface 141 arranged upwards and the proportional flow valve 100 further includes a first fastening assembly 10, the first fastening assembly 10 is arranged annularly and located on the contact step surface 141; an outer ring of the first fastening assembly 10 is in sealing contact with a surface of the inner wall of the second mounting hole; a first annular fastening space is formed in the first fastening assembly 10; the inner ring of the sealing ring 41 is hermetically wrapped in the valve core assembly and the outer ring of the sealing ring 41 is fastened in the first annular fastening space. With this arrangement, the installation of the sealing ring 41 is carried out.

[0061] In order to ensure more stable installation of the second annular support bank 13, the proportional flow valve 100 further includes a transition block 101, the transition block 101 is positioned in the mounting hole and below the coil 21 to support the coil 21, and the transition block 101 is hermetically sealed at one lower end of the second magnetic shielding sleeve 132, a side wall of the transition block 101 is in sealing contact with a side wall of the mounting hole and a face of the lower end of the transition block 101 is mounted on the face of the upper end of the support bank cylinder 131. In this way, the transition block 101 is connected to the support bank cylinder 131, of Petition 870260066620, dated 06 / 07 / 2026, page 31 / 102 24 / 27 so that the second annular support bank 13 can be installed more stably.

[0062] With reference to Fig. 2, an inner bore of the support bank cylinder 131 is fitted as a conical bore, wherein the diameter of an upper end of the conical bore is smaller than the diameter of a lower end of the conical bore, and the lower end of the valve core assembly is arranged in steps to form an upward-facing annular third-step surface 34, and the preload force structure includes an annular elastic sheet 51, the inner ring of the annular elastic sheet 51 abuts the surface of the annular third-step 34 and the outer ring of the annular elastic sheet 51 is fixed to the face of the upper end of the valve body 14. In this way, the annular elastic sheet 51 generates a downward preload force on the valve core assembly, which has a good effect.And the conical orifice, in which the diameter of an upper end of the conical orifice is smaller than the diameter of a lower end of the conical orifice, thus providing a space for activity for the annular elastic sheet 51.

[0063] In order to prevent the transition block 101 from rotating relative to the cylinder of the support bank 131, an anti-rotation structure is further disposed between the face of the lower end of the transition block 101 and the face of the upper end of the cylinder of the support bank 131. In this way, the transition block 101 is prevented from rotating relative to the cylinder of the support bank 131, so that the air tightness of the proportional flow valve 100 is ensured and the effect is good.

[0064] It should be noted that the anti-rotation structure can be a convex and a groove that cooperate with each other. In the present invention, the anti-rotation structure is a pin, through which the anti-rotation positioning of the transition block 101 and the support bench cylinder 131 is achieved and the transition block 101 is prevented from rotating relative to the support bench cylinder 131.

[0065] With reference to Fig. 3, the face of the lower end of the valve core 32 Petition 870260066620, dated 06 / 07 / 2026, page 32 / 102 25 / 27 is provided with a connection hole; the face of the lower end of the movable armature 31 is provided with a third mounting hole that extends upwards and downwards; The valve core assembly further includes a connecting column 35; the upper end of the connecting column 35 is installed in the third mounting hole, the lower end of the connecting column 35 is inserted into the connecting hole, and the air guide passage b is formed in the connecting column 35. In this way, the valve core 32 and the movable armature 31 are connected via the connecting column 35, and the air guide passage b is arranged in the connecting column 35, which has a simple structure and is easy to manufacture.

[0066] In one embodiment, the connecting column 35 is arranged in steps to form a fourth step surface 351 arranged upwards and a second annular mounting space is formed between the fourth step surface 351 and the face of the lower end of the movable armature 31; the mounting cavity is formed with a fifth step surface 15 arranged downwards and the fifth step surface 15 is located below the fourth step surface 351; the preload force structure includes an annular elastic sheet 51, the inner ring of the annular elastic sheet 351 is fixed in the second annular mounting space and the outer ring of the annular elastic sheet 51 rests against the fifth step surface 15. With this arrangement, the installation of the annular elastic sheet 51 is carried out and the annular elastic sheet 51 exerts a preload force on the valve core 32 in the initial position, so that the sealing effect of the proportional flow valve 100 is good.

[0067] It should be noted that the inner ring of the annular elastic sheet 51 is fixed in the second annular mounting space and the inner ring of the annular elastic sheet 51 can move up and down in the second annular mounting space. Specifically, referring to Fig. 3, the inner ring of the annular elastic sheet 51 rests against the surface of the fourth step 351, which facilitates the activity of the annular elastic sheet 51 and has a good Petition 870260066620, dated 06 / 07 / 2026, page 33 / 102 26 / 27 effect.

[0068] In one embodiment, the connecting column 35 is also formed with a sixth-step surface 352 arranged downwards and a third annular mounting space is formed between the sixth-step surface 352 and a face of the upper end of the valve core 32; the mounting cavity is formed with a seventh annular step surface 16 arranged downwards and the seventh annular step surface 16 is provided with a second fastening assembly 102, the second fastening assembly 102 is arranged annularly, an outer ring of the second fastening assembly 102 is in sealing contact with the inner wall surface of the mounting cavity and a fourth annular fastening space is formed in the second fastening assembly 102; the inner ring of the sealing ring 41 is fixed in the third annular mounting space and the outer ring of the sealing ring 41 is fixed in the fourth annular fastening space. With this arrangement, the installation of the sealing ring 41 is carried out with good effect.

[0069] It should be noted that, in the present invention, the air gap refers to the valve core opening of the proportional flow valve, and the gap formed by the gap between the lower end of the static armature and the end of the moving armature is an electromagnet air gap. By changing the electromagnet air gap, the electromagnetic force is changed. And the variation of the air gap is also the variation of the valve core. Referring to Figs.From 6 to 8, the electromagnetic force is inversely proportional to the change in air space (equal to the valve opening), and the preload force is also inversely proportional to the valve opening. The law of variation of the electromagnetic force curve and the preload force curve is the same, and the distance between the electromagnetic force curve and the preload force curve is always the same, so the force to achieve the balance of the valve core together with the electromagnetic force and the preload force is a constant value. And adjusting the distance between the electromagnetic force curve and the preload force curve... Petition 870260066620, dated 06 / 07 / 2026, page 34 / 102 27 / 27 load, the proportional flow valve of the invention can be applied to working conditions with and without backpressure, and the effect is good.

[0070] The above embodiments are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any equivalent structural transformation made using the content of the descriptive report and drawings of this invention under the concept of this invention, or direct / indirect invention in other related technical fields, is included within the scope of patent protection of this invention.

Claims

1. Proportional flow valve (100), comprising: a valve housing assembly (1), formed with a mounting cavity with an opening at a lower end; an air inlet bank (6) is formed at an opening end of the mounting cavity and located in the middle part of the mounting cavity, and an air inlet passage (61) extending upwards and downwards is formed in the air inlet bank (6); an electromagnet assembly (2), disposed at an upper end of the mounting cavity and used to provide upward magnetic attraction; a valve core assembly, disposed in the mounting cavity and located in the middle part of the mounting cavity, an annular mounting cavity (a) is formed between the valve core assembly and a surface of the inner wall of the mounting cavity; actuated by magnetic attraction, the valve core assembly has an upward stroke;an air guide passage (b) is formed in the valve core assembly, an inlet of the air guide passage (b) is formed at a lower end of the valve core assembly and is communicated with the air inlet passage (61) and an outlet is formed at the side end of the valve core assembly; a sealing ring structure comprising a sealing ring (41) sealed in the annular mounting cavity (a), an inner ring of the sealing ring (41) is wrapped around the valve core assembly and an outer ring of the sealing ring (41) is fixedly installed in the mounting cavity, so as to separate the annular mounting cavity (a) into a closed upper annular mounting cavity (a1) and a closed lower annular mounting cavity (a2), and the upper annular mounting cavity (a1) is communicated with an outlet of the air guide passage (b);a preload force structure, disposed between the valve core assembly Petition 870260066620, dated 06 / 07 / 2026, page 36 / 102 2 / 9 and an inner wall of the mounting cavity, and used to provide downward preload force to the valve core assembly; and an air outlet space communicating with the lower annular mounting cavity (a2) may be formed between the lower end of the valve core assembly and an upper end of the air inlet bank (6); characterized in that: the preload force structure comprises an annular elastic sheet (51), an inner end of the annular elastic sheet (51) is fixed to the valve core assembly and an outer end is fixed to the inner wall of the mounting cavity;an annular surface of the annular elastic sheet (51) is provided with a hollow pattern combination, the hollow pattern combination being a central symmetrical structure comprising a plurality of hollow pattern units, and the number of hollow pattern units being an integer multiple of a natural number 2 or more; and / or the electromagnet assembly (2) comprises a coil (21) extending upwards and downwards and fixedly installed in the mounting cavity and a static armature (22) fixedly installed in an internal hole of the coil (21); when the coil (21) is electrified, the static armature (22) forms the magnetic attraction; the valve core assembly comprises a movable armature (31) and a valve core (32), the movable armature (31) is positioned between the static armature (22) and the valve core (32), an upper end of the movable armature (31) is spaced from a lower end of the static armature (22), so as to form an electromagnet air gap (c);a lower end of the movable armature (31) is connected to an upper end of the valve core (32), and the air outlet space is formed between a lower end face of the valve core (32) and an upper end face of the air inlet bank (6); the valve housing assembly (1) further comprises: a housing (12), a lower end face of the housing (12) is penetrated by a mounting hole extending upwards and downwards, and the coil (21) is mounted in the mounting hole; a second annular support bank (13), installed at the lower end of the housing (12), and an inner hole of the second annular support bank (13) is communicated with the mounting hole to jointly form the mounting cavity; a valve body (14), installed in the inner orifice of the second annular support bank (13) and located above the air inlet bank (6);and the valve body (14) and the air inlet bank (6) are arranged integrally.; 2. Proportional flow valve (100), comprising: a valve housing assembly (1), formed with a mounting cavity with an opening at a lower end, an air inlet bank (6) is formed at an opening end of the mounting cavity and located in the central part of the mounting cavity, and an air inlet passage (61) extending upwards and downwards is formed in the air inlet bank (6); an electromagnet assembly (2), disposed at an upper end of the mounting cavity and used to provide upward magnetic attraction; a valve core assembly, disposed in the mounting cavity and located in the central part of the mounting cavity, an annular mounting cavity (a) is formed between the valve core assembly and an inner wall surface of the mounting cavity; actuated by magnetic attraction, the valve core assembly has an upward stroke;an air guide passage (b) is formed in the valve core assembly, an air guide passage inlet (b) is formed at a lower end of the valve core assembly and is communicated with the air inlet passage (61), and an outlet is formed at the side end of the valve core assembly; a sealing ring structure comprising a sealing ring (41) Petition 870260066620, dated 06 / 07 / 2026, page. 38 / 102 4 / 9 sealed in the annular mounting cavity (a), an inner ring of the sealing ring (41) is fitted into the valve core assembly and an outer ring of the sealing ring (41) is fixedly installed in the mounting cavity, so as to separate the annular mounting cavity (a) into a closed upper annular mounting cavity (a1) and a closed lower annular mounting cavity (a2), and the upper annular mounting cavity (a1) is connected to an air guide passage outlet (b);a preload force structure, disposed between the valve core assembly and an inner wall of the mounting cavity, and used to provide downward preload force to the valve core assembly; and an air outlet space communicating with the lower annular mounting cavity (a2) may be formed in use between the lower end of the valve core assembly and an upper end of the air inlet bank (6) characterized in that: the preload force structure comprises an annular elastic sheet (51), an inner end of the annular elastic sheet (51) is fixed to the valve core assembly and an outer end is fixed to the inner wall of the mounting cavity;an annular surface of the annular elastic sheet (51) is provided with a hollow pattern combination, the hollow pattern combination being a central symmetrical structure comprising a plurality of hollow pattern units, and the number of hollow pattern units being an integer multiple of a natural number 2 or more; and / or the electromagnet assembly (2) comprises a coil (21) extending upwards and downwards and fixedly installed in the mounting cavity and a static armature (22) fixedly installed in an internal hole of the coil (21); when the coil (21) is electrified, the static armature (22) forms the magnetic attraction;the valve core assembly comprises a movable armature (31) and a valve core (32), the movable armature (31) is positioned between the static armature (22) and the valve core (32), an upper end of the movable armature (31) is spaced from a lower end of the static armature (22), so as to form an electromagnet air gap (c); a lower end of the movable armature (31) is connected to an upper end of the valve core (32), and the air outlet gap is formed between a lower end face of the valve core (32) and an upper end face of the air inlet bank (6); the lower end face of the valve core (32) is provided with a connection hole; a lower end face of the movable armor (31) is provided with a third mounting hole that extends upwards and downwards;and the valve core assembly further comprises a connecting column (35), an upper end of the connecting column (35) is installed in the third mounting hole, a lower end of the connecting column (35) is inserted into the connecting hole and the air guide passage (b) is formed in the connecting column (35).; 3. Proportional flow valve (100), according to claim 1, characterized in that a first air guide passage segment (b1) is installed on the face of the lower end of the valve core (32) and the face of the lower end of the movable armature (32) is provided with a first mounting hole (311) extending upwards and downwards; a side wall surface of the first mounting hole (311) is provided with a second air guide passage segment (b2), the upper end of the valve core (32) is installed in the first mounting hole (311) and the first air guide passage segment (b1) is communicated with the second air guide passage segment (b2) to jointly form the air guide passage (b);and the proportional flow valve (100) further comprises a first magnetic shielding sleeve (8) extending upwards and downwards, and the first magnetic shielding sleeve (8) is disposed between the coil (21) and the moving armature (31) and covers at least partially the mounting segment. Petition 870260066620, dated 06 / 07 / 2026, p. 40 / 102 6 / 9; 4. Proportional flow valve (100), according to claim 2, characterized in that a first air guide passage segment (b1) is installed through the face of the lower end of the valve core (32), and the face of the lower end of the movable armature (31) is provided with a first mounting hole (311) extending upwards and downwards; a side wall surface of the first mounting hole (311) is provided with a second air guide passage segment (b2), the upper end of the valve core (32) is installed in the first mounting hole (311), and the first air guide passage segment (b1) is communicated with the second air guide passage segment (b2) to jointly form the air guide passage (b);and the movable armature (31) is positioned at a lower end of the inner bore of the coil (21), and a non-metallic magnetic separator (7) is disposed between the upper end of the movable armature (31) and the lower end of the static armature (22).; 5. Proportional flow valve (100), according to claim 3, characterized in that an upper end of the first magnetic shielding sleeve (8) is positioned in the inner hole of the coil (21) and a lower end of the first magnetic shielding sleeve (8) projects from a lower end of the coil (21); the lower end of the static armature (22) and the upper end of the moving armature (31) are both installed in the first magnetic shielding sleeve (8), and the side wall of the static armature (22) is in sealing contact with an inner wall of the first magnetic shielding sleeve (8).

6. Proportional flow valve (100), according to claim 5, characterized in that the air guide passage (b) is formed in the valve core (32) and in the movable armature (31); an air space is formed between a side wall of the movable armature (31) and an outer side wall of the first magnetic shielding sleeve (8), and the air space communicates with the air space of the electromagnet (c), the outlet of the air guide passage (b) and the upper annular mounting cavity (a1).

7. Proportional flow valve (100), according to claim 1, characterized in that a side wall of the upper end of the valve body (14) is threaded into connection with an inner wall of the inner orifice of the second annular support bank (13);and / or the second annular support bank (13) comprises a support bank cylinder (131) and a second magnetic shielding sleeve (132) extending upwards from a face of the upper end of the support bank cylinder (131), the face of the upper end of the support bank cylinder (131) is in sealing contact with the face of the lower end of the housing (12), an upper end of the second magnetic shielding sleeve (132) extends into the inner bore of the coil (21), the lower end of the static armature (22) and the upper end of the moving armature (31) are both installed in the second magnetic shielding sleeve (132) and the side wall of the static armature (22) is in sealing contact with an inner wall of the second magnetic shielding sleeve (132);and / or a face of the upper end of the valve body (14) is penetrated with a second mounting hole and the second mounting hole is arranged in steps to form an upward-disposed contact step surface (141) and the proportional flow valve (100) further comprises a first fastening assembly (10), the first fastening assembly (10) is annullarily arranged and located on the contact step surface (141); an outer ring of the first fastening assembly (10) is in sealing contact with a surface of the inner wall of the second mounting hole; a first annular fastening space is formed in the first fastening assembly (10); the inner ring of the sealing ring (41) is hermetically enclosed in the valve core assembly and the outer ring of the sealing ring (41) is fixed in the first annular fastening space.

8. Proportional flow valve (100), according to claim 7, characterized in that the proportional flow valve (100) further comprises a transition block (101), the transition block (101) being positioned in the mounting hole and below the coil (21), and the transition block (101) being hermetically enclosed in a lower end of the second magnetic shielding sleeve (132), a side wall of the transition block (101) being in sealing contact with a side wall of the mounting hole and a face of the lower end of the transition block (101) being mounted on the face of the upper end of the support bank cylinder (131); and / or an internal hole of the support bank cylinder (131) being fitted as a conical hole, wherein a diameter of an upper end of the conical hole is smaller than a diameter of a lower end of the conical hole;and the lower end of the valve core assembly is arranged in steps to form an upward-facing annular third step surface (34), and the preload force structure comprises an annular elastic sheet (51), the inner ring of the annular elastic sheet (51) abuts the annular third step surface (34) and the outer ring of the annular elastic sheet (51) is fixed to the face of the upper end of the valve body (14).; 9. Proportional flow valve (100), according to claim 2, characterized in that the connecting column (35) is arranged in steps to form a fourth step surface arranged upwards and a second annular mounting space is formed between the fourth step surface and the face of the lower end of the movable armature (31); the mounting cavity is formed with a fifth step surface (15) arranged downwards and the fifth step surface (15) is located below the fourth step surface; the preload force structure comprises an annular elastic sheet (51), the inner ring of the annular elastic sheet (51) is fixed in the second annular mounting space and the outer ring of the annular elastic sheet (51) abuts against the fifth step surface (15).

10. Proportional flow valve (100), according to claim 9, characterized in that the connecting column (35) is also formed with a sixth step surface (352) arranged downwards and a third annular mounting space is formed between the sixth step surface (352) and a face of the upper end of the valve core (32); the mounting cavity is formed with a seventh annular step surface (16) arranged downwards and the seventh annular step surface (16) is provided with a second fastening assembly (102), the second fastening assembly (102) is annularly arranged, an outer ring of the second fastening assembly (102) is in sealing contact with the inner wall surface of the mounting cavity and a fourth annular fastening space is formed in the second fastening assembly (102);The inner ring of the sealing ring (41) is fixed in the third annular mounting space and the outer ring of the sealing ring (41) is fixed in the fourth annular mounting space.

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